媳妇可以长相依马子不能替代妻
[xí fù kĕ yĭ zhăng xiāng yī mă zi bù néng tì dài qī]
The term '媳妇女' (wife) here represents a long-lasting, committed relationship, as opposed to '马子' (mistress), which cannot replace a real wife. The name suggests that the true bond between spouses is unique and irreplaceable.